In your GI loss of HCO3, "change HCO3 to HCO3 precursors" since what we lose in diarrhea is not HCO3 per se since pH of the stool is not acidic, we lose citrate, etc which transform into HCO3 eventually

Interesting comment on renal bicarb loss: I would add an extra group and call it decrease renal NH4+ excretion and add distal RTA, renal insufficiency and hypoaldosteronism. You don't lose HCO3 in distal RTA or hypoaldosteronism. You could argue that NH4+ synthesis in proximal tubule generates "new HCO3" but the student will get lost in that concept

In the renal HCO3 loss group I would add post-treatment of DKA, and post-hypocapnia

Toluene can cause both anion gap and non anion gap metabolic acidosis but the non anion gap is more common because the unmeasured anions are rapidly excreted by the kidneys

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